The Republican chairmen of two House committees announced Tuesday they are opening an investigation into the decisions made by the Justice Department during last year's presidential election.

"Decisions made by the Department of Justice in 2016 have led to a host of outstanding questions that must be answered," House Judiciary Chairman Bob Goodlatte, and House Oversight Chairman Trey Gowdy said in a joint announcement.

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"The committees will review these decisions and others to better understand the reasoning behind how certain conclusions were drawn."

The decisions include the FBI's handling of Hillary Clinton's email probe and its timeline, as well as the FBI's decision not to announce the investigation into possible collusion between then-candidate Donald Trump and Russia.

The Justice Department has not yet responded to CNN's request for comment.The announcement comes at the same time the House intelligence committee and the oversight committee announced a joint investigation into an Obama-era uranium deal.

The news also comes after Trump renewed his criticism of James Comey and how the fired FBI director handled the investigation of Clinton's emails in a series of tweets last week. Responding to reports Comey had drafted a statement on Clinton's email investigation months ahead of delivery, Trump asked: "Where is Justice Dept?"